Slar was the master of seven slaves assigned to disassemble the Defiant. When the Defiant escaped the Tholianspacedock, Slar began killing several of the Terran crewmembers, including Kelby, and stole several key components of the warp engines. Slar contacted Jonathan Archer, demanding a shuttlecraft to leave the ship. Archer refused, saying it was not a negotiation.

Slar was killed in an ensuing battle against Archer in a corridor of the Defiant. Archer had T'Pol increase the polarity of the gravity plating in the corridor, forcing Slar to the ground under an increased gravitational force. Archer then shot Slar several times with a phase rifle, effectively dealing with an unfortunate setback. (ENT: "In a Mirror, Darkly")